Get Rearranging Formulas Worksheet

When changing the subject of a formula, we rearrange the formula so that we have a different subject. In other words, if you move a term from one side of the equals sign to the other, change the operation to do the opposite. (The opposite of an operation is called its inverse).

0:07 4:52 Key Skill - Change the subject of a linear formula with brackets. YouTube Start of suggested clip End of suggested clip So to get rid of the times by three we do the opposite. Which is dividing by three so if we divideMoreSo to get rid of the times by three we do the opposite. Which is dividing by three so if we divide both sides by three. Now there is another way of doing this which i'll show you in a second.

1:51 3:30 Rearranging Formulas - YouTube YouTube Start of suggested clip End of suggested clip The equation reads a equals x times R and we're solving for the variable R. In this case. The firstMoreThe equation reads a equals x times R and we're solving for the variable R. In this case. The first step is to move X from the right hand side to the left hand side right. Now it's multiplying by R.

Example Rearrange y =11+7x to make x the subject. Solution Starting from y =11+7x we subtract 11 from each side to give y − 11 = 7x. Then, dividing both sides by 7 gives y − 11 7 = x. Finally x = y − 11 7 .

For example, Y is the subject of the following equations. Y = x + 1, Y = 4 + 2x, Y = 2(2x – 3). In the relation v=u + at, v is said to be the subject. When a formula is rearranged so that a different letter becomes the subject, this process is referred to as changing the subject of the relation.

In order to make x the subject: Isolate the variable by: ... Rearrange the equation so each term containing x is on the same side of the =. Factorisation may be needed if there are multiple terms containing x . ... Perform an operation to ensure only a single x variable is left as the subject.